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A ball A moving with a speed of 99ms1 collides directly with another identical ball B moving with a speed v in the opposite direction, A comes to rest after the collision. If the coefficients of restitution is 0.8, the speed of B before collision, is :


( A ) 81ms2
( B ) 22.5ms1
( C ) 90ms1
( D ) 10ms1
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